Patent GB-1375208-A (GB)
IPC: B29C48/19
Filed: 1971-10-26
Abstract: 1375208 Extruding soap SAVONNERIE CLAIR BERNARD 26 Oct 1971 [26 Oct 1970] 49768/71 Heading B5A [Also in Division C5] An extruded and compression moulded cake of soap material comprises parallel stripes, e.g. of circular section, of one or more differing materials in a base material, The stripes extend continuously around the surface of the cake, and within the cake towards a common axis without meeting stripes extending from an opposite surface of the cake. The stripes may comprise perfumes, deodorants, emollient substances, skin softeners, germicide, or preferably different colours of which various examples are given, of stated composition and relating to grey soap striped with blue, yellow striped with green, pink striped with blue, and white striped with red. A striped extruded soap bar issuing from the extrusion die is cut by an overhead cutter, Fig. 1 (not shown), into pieces which are delivered for compression moulding into the cakes, between a lower stationary die and an upper vertically reciprocable die which may be oriented parallel to, or at an angle to the direction of extrusion, respectively resulting in stripes parallel to, Fig. 4, or at an angle to the axis of the moulded cake. The soap material comprising the stripes is delivered, from a screw extrusion source, at A2 to a die chamber 1 defined between plates 10 and 11 and from which it is discharged towards the die outlet 21 through orifices 16 in the plate 11, the base soap material being discharged from adjacent orifices 13 of tubes 2 which traverse the chamber 1 and are supplied from another screw extrusion source at A1. The stripe material discharges from the orifices 16 along orifices 4 in a plate 3 which maintain it separate from the base material discharged from the orifices 13 along radially inwardly open channels 6 of the plate 3. Each material then passes along alternate radially inwardly open channels 8, of a plate 7, each separately aligned with an orifice 4 or a channel 6 except for diametrically opposed wider channels 8b, which are each aligned with two base material channels 6 to define the side edges of the soap cake to avoid contacting of the stripes at this location during the compression moulding into the cake. The materials from the channels 8, 8b one brought together in a cohesive mass under radial compression during passage along a frusto-conical bore of a die member 18 having the bore surface defined by parallel sided shallow grooves 20 which are of the same width as, and are aligned with the channels 8 along which the stripe material passes. The soap material from the bore of member 18 is discharged to the die outlet 21 along a frusto-conical bore of greater angle in a die member 19, and which comprises grooves 21 in alignment with grooves 20 but having tapering sides. A torpedo 15 is provided upstream-and downstream of plates 10 and 11, between the cylindrical surface whereof and walls 17 of member 7 a small clearance is provided. Seals J and 26 are provided between various die members, which are clamped in position by a plate 24 and bolts and screws 23<SP>1</SP>, 23. For stripes of more than one material, each is supplied from separate extrusion sources to separate chambers of, and discharge orifices from the chamber 1. The die is preferably maintained 60 to 70 C.